@charset "utf-8";
$font-size: 40;
@function r($px) {
    @return $px/$font-size*1rem; //计算rem
}

@mixin aImg {
    overflow: hidden;
    position: relative;
    img {
        position: absolute;
        //      width: 100%;
        top: -9999px;
        bottom: -9999px;
        left: -9999px;
        right: -9999px;
        margin: auto;
    }
}

.back {
    width: 9.375%;
    height: r(54);
    position: absolute;
    bottom: r(28);
    right: 4.21875%;
    img {
        width: 100%;
    }
}

.touch {
    opacity: .7;
}

.hidden {
    display: none;
}